﻿// Copyright (c) Matthias Koch
//
// See the NOTICE file distributed with this work for additional information
// regarding copyright ownership.  rubicon licenses this file to you under 
// the Apache License, Version 2.0 (the "License"); you may not use this 
// file except in compliance with the License.  You may obtain a copy of the 
// License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the 
// License for the specific language governing permissions and limitations
// under the License.
// 

using System;
using System.Linq.Expressions;

using XValidation.Exceptions;

namespace XValidation.Validations
{
  public class LambdaValidation<T> : IValidation
  {
    private readonly Action<T, string> _lambda;

    public LambdaValidation (Action<T, string> lambda)
    {
      _lambda = lambda;
    }

    public virtual void Validate (object value, string paramName, IValidationContext context)
    {
      if (value is T)
        Validate ((T) value, paramName);
      else
      {
        throw new IncompatibleTypeException (typeof (T), paramName);
      }
    }

    private void Validate (T value, string paramName)
    {
      try
      {
        _lambda ((T) value, paramName);
      }
      catch (ValidationException)
      {
        throw;
      }
      catch (Exception exception)
      {
        throw new LambdaValidationException (_lambda, paramName, exception);
      }
    }
  }
}